package com.warren.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.rabbitmq.client.AMQP;
import com.rabbitmq.client.Channel;
import com.warren.common.exception.NoStockException;
import com.warren.common.to.mq.OrderTo;
import com.warren.common.to.mq.StockDetailTo;
import com.warren.common.to.mq.StockLockedTo;
import com.warren.common.utils.R;
import com.warren.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.warren.gulimall.ware.entity.WareOrderTaskEntity;
import com.warren.gulimall.ware.feign.OrderFeignService;
import com.warren.gulimall.ware.feign.ProductFeignService;
import com.warren.gulimall.ware.service.WareOrderTaskDetailService;
import com.warren.gulimall.ware.service.WareOrderTaskService;
import com.warren.gulimall.ware.vo.OrderItemVo;
import com.warren.gulimall.ware.vo.OrderVo;
import com.warren.gulimall.ware.vo.SkuHasStockVo;
import com.warren.gulimall.ware.vo.WareSkuLockVo;
import lombok.Data;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.warren.common.utils.PageUtils;
import com.warren.common.utils.Query;

import com.warren.gulimall.ware.dao.WareSkuDao;
import com.warren.gulimall.ware.entity.WareSkuEntity;
import com.warren.gulimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.SocketUtils;
import org.springframework.util.StringUtils;

@RabbitListener
@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    private WareSkuDao wareSkuDao;

    @Autowired
    private ProductFeignService productFeignService;

    @Autowired
    WareOrderTaskService orderTaskService;

    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;


    @Autowired
    RabbitTemplate rabbitTemplate;

    @Autowired
    OrderFeignService orderFeignService;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> queryWrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)) {
            queryWrapper.eq("sku_id", skuId);
        }
        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(wareId)) {
            queryWrapper.eq("ware_id", wareId);
        }
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                queryWrapper
        );
        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //判断如果没有此库存记录,则为新增操作;如果有则为更改操作
        List<WareSkuEntity> wareSkuEntities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (wareSkuEntities == null || wareSkuEntities.size() == 0) {
            WareSkuEntity wareSkuEntity = new WareSkuEntity();
            wareSkuEntity.setSkuId(skuId);
            wareSkuEntity.setStock(skuNum);
            wareSkuEntity.setWareId(wareId);
            wareSkuDao.insert(wareSkuEntity);
            //1.自己catch异常
            // TODO 其他方法
            try {
                R info = productFeignService.info(skuId);
                Map<String,Object> data = (Map<String,Object>)info.get("skuInfo");

                if (info.getCode() == 0){
                    wareSkuEntity.setSkuName((String) data.get("skuName"));
                }
            } catch (Exception e) {

            }
        } else {
            wareSkuDao.addStock(skuId, wareId, skuNum);
        }
    }

    /**
     * 获取库存
     * @param skuIds
     * @return
     */
    @Override
    public List<SkuHasStockVo> getSkuHasStock(List<Long> skuIds) {

        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            //查询当前sku的总库存量
            Long count = baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count == null ? false : count > 0);
            return vo;
        }).collect(Collectors.toList());

        return collect;
    }

    /**
     * 锁住库存
     * @param vo
     * @return
     */
    @Transactional(rollbackFor = NoStockException.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {

        /**
         * 保存库存工作单的详情,用于追溯
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);

        //1.按照下单的收获地址，找到一个就近仓库，锁定库存
        //1.找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());
        //2.锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            Integer num = hasStock.getNum();
            if(wareIds == null || wareIds.size()==0){
                //没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }else {
                for (Long wareId : wareIds) {
                    //下面这个数据表示几行数据收到影响，成功返回1，否则返回0
                    Long count = wareSkuDao.lockSkuStock(skuId,wareId,num);
                    if(count==1){
                        skuStocked = true;
                        //TODO 告诉MQ库锁成功
                        //存入数据库，做记录
                        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null,skuId,"",hasStock.getNum(), taskEntity.getId(), wareId,1);
                        orderTaskDetailService.save(entity);
                        StockLockedTo to = new StockLockedTo();
                        StockDetailTo detailTo = new StockDetailTo();
                        to.setId(taskEntity.getId());
                        BeanUtils.copyProperties(entity,detailTo);
                        //防止回滚之后找不到数据，所以保存完整库存单
                        to.setDetail(detailTo);
                        rabbitTemplate.convertAndSend("stock-event-exchange","stock.locked",to);
                        break;
                    }else {
                        //当前仓库锁失败，重试下一个仓库
                    }
                }
            }
            if(skuStocked == false){
                //当前商品所有仓库都没有锁住
                throw new NoStockException(skuId);
            }
        }

        return true;
    }

    @Override
    public void unLockStock(StockLockedTo to){
        StockDetailTo detail = to.getDetail();
        Long detailId = detail.getId();
        /**
         * 解锁
         * 1.查询数据库关于这个订单的锁定库存信息
         * 有： 证明库存锁定成功了
         *      解锁：订单情况。
         *      1.没有这个订单。必须解锁
         *      2.有这个订单。不一定解锁库存
         *          a.已取消，解锁库存
         *          b.没取消,不能解锁
         *
         *  没有： 库存锁定失败了，库存回滚了。这种情况无需解锁
         */
        WareOrderTaskDetailEntity orderTaskDetailEntity = orderTaskDetailService.getById(detailId);
        if (orderTaskDetailEntity != null){
            //解锁
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0){
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });
                //订单没有，订单已取消
                if (data == null || data.getStatus() == 4){
                    //当前库存工作单详情，状态是1已锁定，才能解锁
                    if(orderTaskDetailEntity.getLockStatus() == 1){
                        unLockStock(detail.getSkuId(),detail.getWareId(),detail.getSkuNum(),detailId);
                    }
                }
            }else{
                //其它状态(包含订单成功)不解锁
                throw new RuntimeException("远程服务失败");
            }
        }else{
            //没有，库存锁定失败，库存回滚，这种情况无需解锁

        }
    }

    /**
     * 解锁
     * @param skuId
     * @param wareId
     * @param num
     * @param detailId
     */
    private void unLockStock(Long skuId, Long wareId, Integer num, Long detailId) {
        //解锁
        wareSkuDao.unlockStock(skuId,wareId,num);
        //更新库存工作单状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(detailId);
        entity.setLockStatus(2);
        orderTaskDetailService.updateById(entity);
    }

    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {

        String orderSn = orderTo.getOrderSn();
        //查询最新库存状态,防止重复解锁
        WareOrderTaskEntity task = orderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        //按照工作找到所有没有解锁的库存，进行解锁
        List<WareOrderTaskDetailEntity> list = orderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>().eq("task_id", id)
                .eq("lock_status", 1));
        for (WareOrderTaskDetailEntity entity : list) {
            unLockStock(entity.getSkuId(), entity.getWareId(), entity.getSkuNum(), entity.getId());
        }
    }

    @Data
    class SkuWareHasStock{
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }
}